Beberapa bagian hilang saat merender objek 3D di Android (java) menggunakan OpenGLES 2

Saya baru mengenal OpenGL, dan saya mencoba memuat file .obj ke dalam aplikasi Android saya dan menampilkannya menggunakan OpenGLES 2. Objek telah dirender. Namun ada beberapa ruang di dalamnya seperti gambar di bawah ini. Bagaimana cara memperbaikinya?

Ini adalah objek sebenarnya.

Ini kode saya (tambahan: Saya menggunakan ini di pelacak Instan MaxST)

objLoader = new ObjLoader(context, "andy.obj");

    numFaces = objLoader.numFaces;


    positions = ByteBuffer.allocateDirect(objLoader.positions.length * mBytesPerFloat)
            .order(ByteOrder.nativeOrder()).asFloatBuffer();
    positions.put(objLoader.positions).position(0);

    normals = ByteBuffer.allocateDirect(objLoader.normals.length * mBytesPerFloat)
            .order(ByteOrder.nativeOrder()).asFloatBuffer();
    normals.put(objLoader.normals).position(0);

    textureCoordinates = ByteBuffer.allocateDirect(objLoader.textureCoordinates.length * mBytesPerFloat)
            .order(ByteOrder.nativeOrder()).asFloatBuffer();
    textureCoordinates.put(objLoader.textureCoordinates).position(0);

    ByteBuffer bb = ByteBuffer.allocateDirect(objLoader.positions.length * Float.SIZE / 8);
    bb.order(ByteOrder.nativeOrder());
    vertexBuffer = bb.asFloatBuffer();
    vertexBuffer.put(positions);
    vertexBuffer.position(0);

    bb = ByteBuffer.allocateDirect(objLoader.textureCoordinates.length * Float.SIZE / 8);
    bb.order(ByteOrder.nativeOrder());
    textureCoordBuff = bb.asFloatBuffer();
    textureCoordBuff.put(textureCoordinates);
    textureCoordBuff.position(0);


    shaderProgramId = ShaderUtil.createProgram(VERTEX_SHADER_SRC, FRAGMENT_SHADER_SRC);

    positionHandle = GLES20.glGetAttribLocation(shaderProgramId, "a_position");
    textureCoordHandle = GLES20.glGetAttribLocation(shaderProgramId, "a_texCoord");
    mvpMatrixHandle = GLES20.glGetUniformLocation(shaderProgramId, "u_mvpMatrix");
    textureHandle = GLES20.glGetUniformLocation(shaderProgramId, "u_texture");

    textureNames = new int[1];

    GLES20.glGenTextures(1, textureNames, 0);
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureNames[0]);
    GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
    GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
    GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
    GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);

(Kelas ObjLoader berasal dari di sini)

Inilah metode menggambar saya

@Override
public void draw() {
    GLES20.glUseProgram(shaderProgramId);

    GLES20.glVertexAttribPointer(positionHandle, 3, GLES20.GL_FLOAT, false,
            0, vertexBuffer);
    GLES20.glEnableVertexAttribArray(positionHandle);
    GLES20.glVertexAttribPointer(textureCoordHandle, 2, GLES20.GL_FLOAT, false,
            0, textureCoordBuff);
    GLES20.glEnableVertexAttribArray(textureCoordHandle);

    Matrix.setIdentityM(modelMatrix, 0);
    Matrix.multiplyMM(modelMatrix, 0, translation, 0, rotation, 0);
    Matrix.multiplyMM(modelMatrix, 0, modelMatrix, 0, scale, 0);
    Matrix.multiplyMM(modelMatrix, 0, transform, 0, modelMatrix, 0);

    Matrix.multiplyMM(localMvpMatrix, 0, projectionMatrix, 0, modelMatrix, 0);
    GLES20.glUniformMatrix4fv(mvpMatrixHandle, 1, false, localMvpMatrix, 0);

    GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
    GLES20.glUniform1i(textureHandle, 0);
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureNames[0]);

    GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, objLoader.positions.length / 3);

    GLES20.glDisableVertexAttribArray(positionHandle);
    GLES20.glDisableVertexAttribArray(textureCoordHandle);
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0);
}

android java opengl-es primitive opengl-es-2.0
person Venz    schedule 30.03.2020    source sumber

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File model tampaknya terdiri dari paha depan. Jika mukanya berbentuk segi empat, Anda harus membuat 2 segitiga untuk setiap mukanya.

Sesuaikan pemuat objek. misalnya.:

class ObjLoader {
    // [...]

    public ObjLoader(Context context, String file) {
        // [...]

               switch (parts[0]) {
                   // [...]

                    case "f":
                        // faces: vertex/texture/normal
                        if (parts.length == 5) {
                            // triangle 1
                            faces.add(parts[1]);
                            faces.add(parts[2]);
                            faces.add(parts[3]);
                            // triangle 2
                            faces.add(parts[1]);
                            faces.add(parts[3]);
                            faces.add(parts[4]);
                        }
                        else {
                            faces.add(parts[1]);
                            faces.add(parts[2]);
                            faces.add(parts[3]);
                        }
                        break;
                }
        // [...]
    }
}
person Rabbid76    schedule 30.03.2020